AutoCodes – Cadillac – P1B74 Cadillac

P1B74 Cadillac Code - Hybrid/Electric Vehicle Battery 48 Circuit High Voltage

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1B74 Cadillac indicates Hybrid/Electric Vehicle Battery 48 Circuit High Voltage.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,134

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B74 Cadillac Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1B74 Cadillac - Hybrid/Electric Vehicle Battery 48 Circuit High Voltage - AutoCodes.com — P1B74 Cadillac Code - Hybrid/Electric Vehicle Battery 48 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B74 Cadillac?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P1B74 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1B74 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1B74 Cadillac Code

1. What are the common symptoms of OBDII code P1B74 in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced electric vehicle range, warning lights on the dashboard, and potential issues with the high voltage battery system.

2. What causes the OBDII code P1B74 in a Cadillac Hybrid/Electric Vehicle?

- This code is typically triggered by a high voltage circuit fault within the hybrid/electric vehicle battery system, which may be due to wiring issues, connector problems, or a malfunctioning battery module.

3. How can I diagnose the OBDII code P1B74 in my Cadillac Hybrid/Electric Vehicle?

- Diagnosing this code requires specialized diagnostic tools that can read high voltage systems. It is recommended to seek assistance from a qualified technician or a dealership familiar with hybrid/electric vehicle systems.

4. Can I repair the OBDII code P1B74 in my Cadillac Hybrid/Electric Vehicle myself?

- Due to the high voltage nature of the system, it is not recommended for inexperienced individuals to attempt repairs on this code. Seek professional assistance to ensure safety and proper diagnosis and repair.

5. What are some possible repair tips for addressing the OBDII code P1B74 in a Cadillac Hybrid/Electric Vehicle?

- Repair tips may include checking and repairing any damaged wiring, inspecting and cleaning connectors, testing battery modules for faults, and resetting the fault code after repairs are completed.

6. Is it safe to continue driving my Cadillac Hybrid/Electric Vehicle with the OBDII code P1B74 present?

- It is not recommended to continue driving the vehicle with this fault code present, as it may lead to further damage to the high voltage battery system and potentially pose safety risks. Seek professional assistance promptly.

7. How urgent is it to address the OBDII code P1B74 in a Cadillac Hybrid/Electric Vehicle?

- It is important to address this code promptly to prevent potential damage to the high voltage system and ensure the safe operation of the vehicle. Delaying repairs may lead to more costly issues down the line.

8. Can the OBDII code P1B74 in a Cadillac Hybrid/Electric Vehicle be a false alarm?

- While rare, false alarms can occur with any diagnostic trouble code. It is advisable to have the system checked by a professional to confirm the presence of a genuine fault before proceeding with repairs.

9. Will resetting the fault code for P1B74 in my Cadillac Hybrid/Electric Vehicle make it go away permanently?

- Simply resetting the fault code may temporarily clear the warning lights, but if the underlying issue causing the fault code is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause.

10. Are there any recalls or technical service bulletins related to the OBDII code P1B74 in Cadillac Hybrid/Electric Vehicles?

- It is recommended to check with a Cadillac dealership or the manufacturer's website for any recalls or technical service bulletins related to this specific fault code to see if there are known issues or remedies available.